Table 2.
The relative contents of VOCs in SS from different regions were determined by HS-SPME-GC-MS.
| Code | Compounds | RT | CAS | Relative Content (%) | |||||
|---|---|---|---|---|---|---|---|---|---|
| (Min) | B | N | A | Z | J | S | |||
| Terpenoids | |||||||||
| 1 | myrcene | 6.922 | 123-35-3 | 0.06 ± 0.01 | 0.05 ± 0.02 | 0.03 ± 0.02 | 0.04 ± 0.01 | 0.05 ± 0 | 0.02 ± 0.01 |
| 2 | (−)-limonene | 7.808 | 5989-54-8 | 0.46 ± 0.04 | 0.40 ± 0.07 | 0.19 ± 0.07 | 0.26 ± 0.14 | 0.38 ± 0.14 | 0.21 ± 0.05 |
| 3 | l-menthone | 11.003 | 14073-97-3 | 4.28 ± 0.51 | 4.83 ± 0.77 | 5.60 ± 0.96 | 4.92 ± 0.54 | 5.97 ± 0.47 | 5.80 ± 0.67 |
| 4 | 1,4-cyclohexadiene, 3-ethenyl-1,2-dimethyl- | 7.257 | 62338-57-2 | 0.23 ± 0.03 | 0.22 ± 0.03 | 0.19 ± 0.04 | 0.16 ± 0.02 | 0.16 ± 0 | 0.19 ± 0.02 |
| 5 | 1,3,8-p-menthatriene | 7.721 | 18368-95-1 | 0.28 ± 0.05 | 0.28 ± 0.04 | 0.18 ± 0.03 | 0.16 ± 0.02 | 0.16 ± 0.02 | 0.18 ± 0.01 |
| 6 | (+)-pulegone | 13.565 | 89-82-7 | 36.83 ± 3.16 | 33.76 ± 1.26 | 51.99 ± 5.54 | 51.00 ± 3.05 | 43.69 ± 0.93 | 44.78 ± 2.81 |
| 7 | piperitone | 13.797 | 89-81-6 | 2.46 ± 1.27 | 2.37 ± 0.52 | 0.84 ± 0.31 | 1.76 ± 0.29 | 1.83 ± 0.27 | 1.96 ± 0.22 |
| 8 | β-bourbonene | 18.752 | 5208-59-3 | 0.22 ± 0.02 | 0.21 ± 0.03 | 0.37 ± 0.07 | 0.21 ± 0.05 | 0.20 ± 0.02 | 0.32 ± 0.04 |
| 9 | α-copaene | 18.404 | 3856-25-5 | 0.22 ± 0.02 | 0.18 ± 0.02 | 0.36 ± 0.06 | 0.28 ± 0.08 | 0.19 ± 0.02 | 0.26 ± 0.04 |
| 10 | cubebene | 18.968 | 13744-15-5 | ND | ND | 0.09 ± 0.04 | 0.04 ± 0.03 | ND | ND |
| 11 | caryophyllene | 20.004 | 87-44-5 | 0.39 ± 0.09 | 0.34 ± 0.04 | 2.21 ± 1.04 | 0.96 ± 0.52 | 0.36 ± 0.03 | 0.72 ± 0.12 |
| 12 | β-elemen | 19.055 | 515-13-9 | 0.04 ± 0.01 | ND | 0.12 ± 0.07 | 0.03 ± 0.03 | ND | 0.03 ± 0.02 |
| 13 | (±)-beta-copaene | 22.044 | 18252-44-3 | 0.05 ± 0.03 | 0.04 ± 0.01 | 1.59 ± 1.05 | 0.27 ± 0.20 | 0.04 ± 0.02 | 0.15 ± 0.07 |
| 14 | (−)-humulene epoxide II | 25.868 | 19888-34-7 | 0.08 ± 0.02 | 0.10 ± 0 | 0.07 ± 0.03 | 0.05 ± 0.02 | 0.07 ± 0.02 | 0.09 ± 0.03 |
| 15 | (+)-delta-Cadinene | 23.359 | 483-76-1 | 0.06 ± 0.01 | 0.06 ± 0.01 | 0.23 ± 0.11 | 0.11 ± 0.08 | 0.04 ± 0 | 0.09 ± 0.01 |
| 16 | menthofuran | 11.269 | 494-90-6 | 1.02 ± 0.19 | ND | ND | 0.92 ± 0.13 | ND | ND |
| 17 | (+)-isomenthone | 14.213 | 1196-31-2 | 2.98 ± 0.13 | 3.15 ± 0.34 | 1.08 ± 0.57 | 2.00 ± 0.98 | 2.71 ± 0.21 | 1.91 ± 0.20 |
| 18 | verbenone | 15.194 | 18309-32-5 | 10.96 ± 1.70 | 10.85 ± 0.94 | 5.96 ± 1.42 | 8.00 ± 1.63 | 9.63 ± 0.41 | 8.79 ± 0.85 |
| 19 | caryophyllene oxide | 25.089 | 1139-30-6 | 1.32 ± 0.18 | 1.41 ± 0.08 | 0.94 ± 0.41 | 0.76 ± 0.10 | 1.10 ± 0.23 | 1.44 ± 0.41 |
| Alcohols | |||||||||
| 20 | (E)-p-mentha-2,8-dien-1-ol | 10.52 | 7212-40-0 | 0.18 ± 0.06 | 0.16 ± 0.03 | 0.08 ± 0.02 | 0.10 ± 0.04 | 0.14 ± 0.01 | 0.15 ± 0.02 |
| 21 | isopulegol | 11.999 | 89-79-2 | 0.25 ± 0.04 | 0.29 ± 0.03 | ND | 0.17 ± 0.05 | 0.21 ± 0.02 | 0.13 ± 0.03 |
| 22 | spathulenol | 24.949 | 6750-60-3 | 0.13 ± 0.02 | 0.16 ± 0 | 0.13 ± 0.06 | 0.09 ± 0.02 | 0.11 ± 0.02 | 0.14 ± 0.07 |
| 23 | 2-cyclohexen-1-ol | 12.294 | 74410-00-7 | 0.19 ± 0.10 | 0.21 ± 0.04 | 0.08 ± 0.05 | 0.10 ± 0.05 | 0.20 ± 0.03 | 0.22 ± 0.04 |
| Phenols | |||||||||
| 24 | Thymol | 14.672 | 89-83-8 | 0.06 ± 0.01 | 0.08 ± 0.01 | 0.05 ± 0.02 | 0.06 ± 0.02 | 0.06 ± 0.01 | 0.04 ± 0.03 |
| Esters | |||||||||
| 25 | trans-carveyl acetate | 16.712 | 1134-95-8 | 6.21 ± 0.53 | 6.12 ± 0.65 | 6.18 ± 0.40 | 5.53 ± 0.79 | 5.41 ± 0.07 | 6.01 ± 0.54 |
| 26 | carveylacetate | 16.949 | 97-42-7 | 0.28 ± 0.08 | 0.27 ± 0.05 | 0.24 ± 0.03 | 0.21 ± 0.02 | 0.19 ± 0 | 0.21 ± 0.04 |
| 27 | nepetalactone | 18.124 | 21651-62-7 | 0.61 ± 0.63 | 0.25 ± 0.06 | 0.08 ± 0.06 | 0.12 ± 0.03 | 0.14 ± 0.02 | 0.12 ± 0.02 |
| 28 | dibutyl phthalate | 31.553 | 84-74-2 | 0.15 ± 0.17 | 0.06 ± 0.01 | 0.04 ± 0 | 0.06 ± 0.01 | 0.09 ± 0.03 | 0.08 ± 0.01 |
| Ketones | |||||||||
| 29 | 3-methyl-Cyclohexanone | 6.029 | 591-24-2 | 0.27 ± 0.17 | 0.23 ± 0.08 | 0.13 ± 0.07 | 0.15 ± 0.08 | 0.20 ± 0.02 | 0.24 ± 0.03 |
| 30 | 2-isopropyl-2,5-dimethylcyclohexanone | 12.758 | 20144-44-9 | 4.12 ± 0.41 | 4.06 ± 0.29 | ND | 2.85 ± 0.31 | 3.39 ± 0.14 | 3.23 ± 0.17 |
| 31 | 2-cyclopenten-1-one, 3-ethyl-2-hydroxy- | 8.335 | 21835-01-8 | 0.30 ± 0.03 | 0.27 ± 0.01 | 0.07 ± 0.06 | 0.20 ± 0.07 | 0.24 ± 0.09 | 0.14 ± 0.03 |
| 32 | trans-isopulegone | 11.588 | 29606-79-9 | 1.02 ± 0.08 | 0.93 ± 0.05 | 1.12 ± 0.09 | 0.97 ± 0.07 | 1.13 ± 0.03 | 1.05 ± 0.08 |
| 33 | berbenone | 12.534 | 80-57-9 | 0.46 ± 0.06 | 0.52 ± 0.02 | 0.29 ± 0.06 | 0.29 ± 0.16 | 0.50 ± 0.03 | 0.40 ± 0.04 |
| 34 | piperitenone | 17.128 | 491-09-8 | 3.08 ± 0.14 | 3.40 ± 0.07 | 3.31 ± 0.07 | 3.35 ± 0.15 | 2.81 ± 0.15 | 3.16 ± 0.35 |
| 35 | jasmone | 19.347 | 488-10-8 | 0.10 ± 0.02 | 0.10 ± 0.01 | 0.11 ± 0.02 | 0.08 ± 0.02 | 0.07 ± 0.01 | 0.08 ± 0.01 |
| 36 | 2-isopropylidene-5-methylcyclohexanone | 20.63 | 15932-80-6 | 1.27 ± 0.77 | 2.34 ± 1.34 | 0.45 ± 0.44 | 0.54 ± 0.21 | 0.81 ± 0.26 | 0.29 ± 0.12 |
| 37 | cyclohexanone, 2-(2-butynyl)- | 14.459 | 54166-48-2 | 0.27 ± 0.02 | 0.29 ± 0.03 | 0.23 ± 0.02 | 0.26 ± 0.01 | 0.22 ± 0.01 | 0.17 ± 0.07 |
| 38 | cinerolone | 19.429 | 17190-74-8 | 0.14 ± 0 | 0.18 ± 0.02 | 0.11 ± 0.04 | 0.12 ± 0.02 | 0.09 ± 0 | 0.17 ± 0.01 |
| 39 | trans-Pulegone oxide | 13.125 | 13080-28-9 | 0.38 ± 0.10 | 0.39 ± 0.13 | ND | ND | 0.32 ± 0.04 | ND |
| Others | |||||||||
| 40 | 1-methyl-3-prop-1-en-2-ylbenzene | 9.345 | 1124-20-5 | 0.17 ± 0.02 | 0.15 ± 0.01 | 0.15 ± 0.05 | 0.16 ± 0.02 | 0.15 ± 0.02 | 0.07 ± 0.05 |
| 41 | dehydroxymenthofurolactone | 22.721 | 38049-04-6 | 4.51 ± 1.41 | 5.09 ± 0.90 | 2.22 ± 1.21 | 2.21 ± 1.05 | 3.66 ± 0.53 | 4.08 ± 0.70 |
| 42 | isomintlactone | 23.586 | 75684-66-1 | 0.83 ± 0.22 | 0.95 ± 0.10 | 0.39 ± 0.23 | 0.40 ± 0.17 | 0.69 ± 0.08 | 0.67 ± 0.08 |
“ND” means undetected or content less than 0.01%.